We proposed a three-dimensional model to simulate terahertz generation from LiNbO crystal under intense laser excition (up to ~50 mJ/cm). The impact of three-photon absorption, which leads to free carrier generation and free carrier saturation (when pump fluence above ~10 mJ/cm) on terahertz generation was investigated. And further with this model, we stated the optimized experimental conditions (incident postion, beam diameter, and pulse duration, etc) for maximum generation efficiency in commonly-used tilted-pulse-front scheme. Red shift of spectrum, spatial distribution "splitting" effects of emitted THz beam, and primilary experimental verification under intense laser excitation are given.
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| http://dx.doi.org/10.1364/OE.23.031313 | DOI Listing |
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